This Week in CFD

High Stakes CFD Challenge

It’s difficult to imagine higher stakes for CFD accuracy than predicting whether or not an intracranial aneurysm will rupture. But that’s exactly the basis for a CFD challenge issued by the Otto Von Guericke Universität Magdeburg.

Reconstructed surface geometries of two patient-specific aneursyms are available in STL format. Your challenge is to use CFD to not only predict which one of them ruptured but where. (The challenge’s organizers have video of the rupture.)

Can you predict which one of these two aneurysms will rupture? The two challenge geometries are shown in Pointwise.

Can you predict which one of these two aneurysms will rupture? The two challenge geometries are shown in Pointwise.

A half-page abstract is due by 16 August including your computed wall shear stresses. The second due date is 13 September when participants will repeat the computations using prescribed boundary conditions.

All the details may be found at the CFD Challenge’s website.

Software

  • CADNexus announced the release of Version 1.5 of their CFD Connector. This product provides a framework for iterative CFD studies. The CFD Connector uses CAPRI for the CAD interface, Microsoft Excel for run steup, and OpenFOAM for the CFD. The free version of the CFD Connector works only with geometry in STL format whereas the full version works with CAD in several native formats.
  • Release 7.24.0 of BRL-CAD, the open source CSG modeler, is now available.
  • Beta CAE released ANSA v14.1.2.
  • CCE Labs is offering for free a multi-CAD view called Express 3D. [I installed the software and had no trouble importing and viewing several CAD files. It does not support ACIS files. The application does require you to authenticate using your Twitter, Facebook, or Google account.]

Business

  • CD-adapco has acquired Red Cedar Technology. The two companies have been collaborating for over a year on integration of Red Cedar’s multi-disciplinary design optimization software with CD-adapco’s CFD and CAE tools.
  • If you’re interested in CFD for urban modeling, the Singapore-ETH Center for Global Environmental Sustainability is hiring.

Applications

  • CEI shares two videos illustrating how EnSight can be used to postprocess results from AcuSolve. [Full disclosure: one of the videos is Pointwise’s.]
  • The use of CFD in conjunction with other pipeline software is described in an article about flow assurance. [I’ve always found the phrase “flow assurance” to be both quaint and frightening.]
Gas flow (red) into water (blue) through a T-junction. Image from Offshore Magazine.

Gas flow (red) into water (blue) through a T-junction. Image from Offshore Magazine.

CFD on a Water-Filled Computer

Believe it or not, they say it wasn’t until the 1980s that digital computers surpassed the “water computer” in Russia. The water (or hydraulic) computer shown below was built in 1936 by Vladimir Lukyanov. His area of application wasn’t CFD but the fracture mechanics of concrete. Don’t you think it would be fitting to program a water computer to solve the Navier-Stokes equations?

Vladimir Lukyanov's water computer from 1936. Image from Digital Journal.

Vladimir Lukyanov’s water computer from 1936. Image from Digital Journal.

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